Dopant-specific unzipping of carbon nanotubes for intact crystalline graphene nanostructures

Joonwon Lim, Uday Narayan Maiti, Na-Young Kim, Rekha Narayan, Won Jun Lee, Dong Sung Choi, Youngtak Oh, Ju Min Lee, Gil Yong Lee, Seok Hun Kang, Hyunwoo Kim, Yong-Hyun Kim () and Sang Ouk Kim ()
Additional contact information
Joonwon Lim: National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, KAIST
Uday Narayan Maiti: National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, KAIST
Na-Young Kim: Graduate School of Nanoscience and Technology, KAIST
Rekha Narayan: National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, KAIST
Won Jun Lee: National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, KAIST
Dong Sung Choi: National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, KAIST
Youngtak Oh: National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, KAIST
Ju Min Lee: National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, KAIST
Gil Yong Lee: National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, KAIST
Seok Hun Kang: National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, KAIST
Hyunwoo Kim: KAIST
Yong-Hyun Kim: Graduate School of Nanoscience and Technology, KAIST
Sang Ouk Kim: National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, KAIST

Nature Communications, 2016, vol. 7, issue 1, 1-9

Abstract: Abstract Atomic level engineering of graphene-based materials is in high demand to enable customize structures and properties for different applications. Unzipping of the graphene plane is a potential means to this end, but uncontrollable damage of the two-dimensional crystalline framework during harsh unzipping reaction has remained a key challenge. Here we present heteroatom dopant-specific unzipping of carbon nanotubes as a reliable and controllable route to customized intact crystalline graphene-based nanostructures. Substitutional pyridinic nitrogen dopant sites at carbon nanotubes can selectively initiate the unzipping of graphene side walls at a relatively low electrochemical potential (0.6 V). The resultant nanostructures consisting of unzipped graphene nanoribbons wrapping around carbon nanotube cores maintain the intact two-dimensional crystallinity with well-defined atomic configuration at the unzipped edges. Large surface area and robust electrical connectivity of the synergistic nanostructure demonstrate ultrahigh-power supercapacitor performance, which can serve for AC filtering with the record high rate capability of −85° of phase angle at 120 Hz.

Date: 2016
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DOI: 10.1038/ncomms10364

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